One HTTP Address for Locals and Externals

I need my office network to have a website accessible to both the local network users and also the general public.

I assume that I need a DMZ which involves a new router and firewall configuration.

Anyway, my question is......

After I set up my DMZ, is it possible for both the Internal and External users to be able to connect to the website usng the same address eg ? Do I have to set up an internal DNS server to do this?

[Also, I am assuming that the Internal users will have access to the website across the local network (ie at regular ethernet speeds).]
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you have a office network without a allready existing dns?
and yes, you have to use a internal dns or put a entry for this host in the hosts file on each client.

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eamonrocheAuthor Commented:
No, dont have dns!
All client computers have setting of ISP DNS servers.
you either need a local dns server, or if it is not a lot of pc's you can add a entry into the hosts files of the pc's but DNS is definately preferred way to do things
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